Here are the GOE criteria for a step sequence:
1) good energy and execution
2) good speed or acceleration during sequence
3) good clarity and precision
4) deep clean edges (including entry and exit of all turns)
5) good control and commitment of whole body to accuracy of steps
6) creativity and originality
7) effortless throughout
element enhances the musical structure
It's not about how engaging it is in any GOE criteria other than possibly 8 (but if the steps fit the musical structure, then it still checks off #8). Kostner totally rocks 2, 3, 4, 5 and 7 clearly in every step sequence she does.
SS is not JUST about the step sequence. Kostner had other mistakes that dropped that mark a little (3S << and 1Lo) and with Kim skating last, judges were happy to reward her clean and totally rocked comeback.